Granitoids of the Mauthausen Type in the Czech Part of the Moldanubian Batholith

Abstract

The Moldanubian Batholith is the largest Variscan magmatic complex in the Bohemian Massif, which is part of the Central European Hercynian belt. In northern part of the Moldanubian Batholith occur relatively small bodies of granitoids which could be correlated with biotite granodiorites of the Mauthausen type which occur in the Austrian part of this batholithic complex. The first body is formed by biotite-muscovite granite of the Pavlov type. The second occurrence of granitoids of the Mauthausen type is formed by two, relatively small bodies of the biotite granodiorites of the Pohled type. The estimation of melting temperatures of granitic melts for granitic rocks from Pavlov and Pohled area, based on zircon and monazite saturation thermometers show that melting temperatures were partly higher than those of the Mauthausen granodiorites the Austrian part of the Moldanubian Batholith (732–817°C). Analysed apatites from both areas contain high F (3.05–4.00 wt.%) and little Cl (0.00–0.06 wt.%). The analysed zircons contain low Hf concentrations (0.93–1.65 wt.% HfO2, 0.008–0.013 apfu Hf). The analysed monazites form the Pavlov and Pohled granitoids plot close to the huttonite vector.